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How to query a document in MongoDB comparing fields from an array?
To compare fields from an array, use $gt and $lt. Let us create a collection with documents −
> db.demo147.insertOne({"Details":[{"Score":45},{"Score":46}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e32fa21fdf09dd6d08539be")
}
> db.demo147.insertOne({"Details":[{"Score":65},{"Score":86}]});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e32fa40fdf09dd6d08539bf")
}Display all documents from a collection with the help of find() method −
> db.demo147.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5e32fa21fdf09dd6d08539be"),
"Details" : [
{
"Score" : 45
},
{
"Score" : 46
}
]
}
{
"_id" : ObjectId("5e32fa40fdf09dd6d08539bf"),
"Details" : [
{
"Score" : 65
},
{
"Score" : 86
}
]
}Here is how to query a document in MongoDB comparing fields from an array −
> db.demo147.find({ 'Details.Score': { $gt: 45, $lt: 50 }});This will produce the following output −
{ "_id" : ObjectId("5e32fa21fdf09dd6d08539be"), "Details" : [ { "Score" : 45 }, { "Score" : 46 } ] }
Updated on: 31-Mar-2020
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